Seal



FIG. 1 is a rear perspective view of a seal of a patient interface;

FIG. 2 is a front perspective view of the seal of FIG. 1;

FIG. 3 is a left side elevational view of the seal of FIG. 1;

FIG. 4 is a right side elevational view of the seal of FIG. 1;

FIG. 5 is a rear elevational view of the seal of FIG. 1;

FIG. 6 is a front elevational view of the seal of FIG. 1;

FIG. 7 is a top elevational view of the seal of FIG. 1;

FIG. 8 is a bottom elevational view of the seal of FIG. 1;

FIG. 9 is a close-up of the view of FIG. 6; and,

FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. 9.

Broken lines are used to illustrate features of the seal which form no part of the claimed design. 

CLAIM The ornamental design for a seal, as shown and described. 